Milling-machine



(No Model.) 2 Sheets-Sheet 1.

E. JOHNSON. MILLING MACHINE.

' Patented Aug. 18, 1896.

e U. l. f

Ill/I14 [27 z enfoz'.

l l I I l l l I l l l l ll lllnllxlllllllll Zf'fzzewes.

Tu: Nonms PEYERS co. vuoraumu. wuumomn. n. cy

2 Sheets-Sheet 2.

(No Model.)

B JOHNSON MILLING MACHINE.

Patented Aug I8, 1896.

Fig. 5

UNITED STATES PATENT OFFIC l ERIC JOHNSON, O'F SEATTLE, WASHINGTON.

MILLING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 565,992, dated August18, 1896. Application filed November 27, 1895. Serial No. 670,305. (Nomodel.)

To all whom it may concern.-

Be it known that I, ERIC JOHNSON, a citizen of the United States,residing at Seattle, in the county of King and State of Washington, haveinvented certain new and useful Improvements in Milling-Machines and Ido hereby declare the following to be a ful1,clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

Myinvention'relates to that class of milling-machines especiallydesigned for milling out the circular recesses inthe rims of one varietyof inserted-tooth circular saws and by which the teeth are held inplace.

Figure 1 is a front elevation of my millingmachine; Fig. 2, a frontsectional elevation taken just back of the front band or strap for theeccentric on the outer sleeve, but with the driving friction-disk inplace. Fig. 3 is a rear elevation with the driving-pulleys and roperemoved, but shown in dotted lines. Fig. 4 is a side elevation. Fig. 5is a crosssection of the two eccentric sleeves, taken through one of theslots in the outer one. Figs. 6 and 7 are elevation and top plan of adevice to be put on the clamping-face, so that a radial slot may bemilled in the saw.

In milling the circular recess in the rim ofcircular saws preparatory toinserting teeth therein the mill must be smaller than the circle and themill and saw have a circular travel relative to each other. I accomplishthis by having the cutter-shaft mounted eccentrically in a sleeve, whichis also eccentrically mounted in a second sleeve, and by rotating thesleeves and thus carrying the mill about a center while at the same timeit rotates on its shaft.

The frame A has a dovetailed Way a upon its upper end, upon which slidesthe head 13, carrying all the working parts. This has on its lower sideflanges to fit the ways a on the frame A and at each end straps or bandsB for holding the outer eccentric sleeve 0. This sleeve consists ofacylinder having eccentrics on each end, which eccentrics turn in thestraps or bands 13. This sleeve has within it the cylinder 0, which hasan eccentric hole for the cutter-shaft D. v

The'eccentricities of-the two are the same. It is obvious that in theposition shown in the drawings the cutter-shaft will have no travelabout'its center no matter how much the sleeves are rotated, as theeccentricity of one sleeve balances the eccentricity of the other. If,however, the inner sleeve be rotated in the outer, the center of thecutter-shaft will move inthe dotted semicircle shown in Figs. 2 and 5.In this way the two sleeves may be set so that the shaft will travel ina circle whose radius may be anything from nothing to the combinedeccentricities of the two sleeves. A pointer P on the end of the innersleeve and a scale on the worm-gear E, which is fixed to the outersleeve, indicate the amount of the eccentricity.

The outer sleeve has a couple of circumferential slots 0 extending atrifle over halfway around and entirely through the shell of thecylinder. Clamping-bolts 0 extending through these and into the innercylinder, serve to lock the two in any position when set. To enable thetwo to' be easily rotated and accurately set, a worm-wheel E is fixed tothe outer rear end of the cylinder C-and a worm e mounted in lugs e onthe end of the outer cylinder. The worm-shaft e is squared at both endsand maybe turned by applying a socket-wrench thereto.

Upon the front end of the outer sleeve is fixed the worm-gear E, whichis rotated by the worm E whose shaft is supported in brackets E upon thefront band or strap B. The worm-shaft carries a friction-wheel F, whichengages with a friction-diskF. This disk is mounted on the shaft F whichturns in lugs f upon the sliding head -B and carries on its opposite endthe driving-wheel F. A rope belt G passes over this wheel and one on thecutter-shaft and has suspended on its lower side, by a pulley, a weightG. This 7 provides for the differences in the distances between thecutter-shaft and shaft F due to the cutter-shaft moving about a centerwhile the shaft F is stationary. I

The friction-wheel F may be moved on its shaft so as to engage thefriction-disk F at different distances from the center and vary the rateof feed. Rotating the worm-gear IE will rotate the sleeves and cause thecutter to be carried about in a circle in the manner before described. HI I I To throw the friction driving device into or out of engagement,the shaft is made longitudinally movable and carrying a collar 1' keyedthereto. Surrounding the shaft is the collar i, having handle i and acam-surface 1' on one side engaginga similar cam-surface on theprojecting boss on the lug f. \Vhen this handle is thrown over to oneposition, it will force the disk upon the wheel F and rotate it, whilewhen thrown to the other position it will release the pressure and thefeed will stop.

The saw is supported on the pin II, projecting from a block H, which iscarried on the screw H and slides in ways H on the frame. The screw H isrevolved to raise or lower the block through the bevel-gears h and h andwheelh The screw is supported from its upper end.

The front face of the frame is continued up as two parallel bars,forming a U-shape support which straddles the mill and to which the sawis clamped by the bars A The mill is shown at m.

To enable the head as a whole to be moved on its guideways, a rack-bar Iis fixed to .the head and is engaged by the pinion I upon a shaft whichis journaled in the frame, and carries upon its outer end the wheel 1 bywhich it may be revolved. The head is clamped in place by the set-screwa which presses upon the gib a. A stop to limit the forward motion ofthe head and insure its return to the same place is shown in Fig. 4.This consists of an arm or lug L, fixed to the rear end of the movablehead and projecting beyond a portion of the frame. A set-screw L passingthrough it will engage the frame and limit its forward motion. This willinsure its accurate return to the same point.

To enable my machine to be used for milling in a vertical straight line,I have provided the attachment shown in Figs. 6 and 7. This consists ofan inverted-U-shaped casting having bevel-guideways planed in the backside of the vertical legs, which fit over similar bevel-guides on theouter edges of the arms A of the frame. In using this the saw would beclamped to its front face by the usual clamps A and the eccentric disksset so that their eccentricities are balanced or the moving of thecutter-bar prevented by stopping the feed. The saw is then fed to thework by using the screw H the plate moving by reason of its attachmentto the screw.

IIaving thus described my invention, What I claim, and desire to secureby Letters Patent, is

1. The combination in a milling-machine, with a cutter-spindle and meansfor rotating it, of an inner eccentric sleeve surrounding thecutter-shaft, an outer eccentric sleeve surrounding the inner sleeve,means for looking the sleeves to each other in any position and meansfor rotating said sleeves, substantially as shown and described.

2. The combination in a milling-machine, with acutter-spindle and meansfor rotating it, of an inner eccentric sleeve surrounding said shaft, anouter eccentric sleeve surrounding the inner sleeve, means for lockingthe two sleeves to each other in anyposition, a worm-wheel attached toone of the sleeves, a worm attached to the'frame, and means for rotatingsaid worm, substantially as shown and described.

3. The combination in a milling-machine, with a cutter-spindle and meansfor rotating it, of an inner eccentric sleeve surrounding said shaft, anouter eccentric sleeve surrounding the inner sleeve, means for lockingthe two sleeves to each other in anyposition, a worm-wheel attached toone of the sleeves, a worm attached to the frame, and automatic meansactuated from the cutter-shaft for rotating said worm, substantially asshown and described. I

4. The combination in a milling-machine, with a cutter shaft or spindle,and means for rotating it, of an inner eccentric sleeve surrounding saidshaft, an outer eccentric sleeve surrounding the inner sleeve, means forlocking the two sleeves to each other in any position, a worm-wheelattached to one of the sleeves, a worm attached to the frame, afriction-wheel attached to the worm, a frictiondisk adapted to engagesaid friction-wheel and means for rotating said disk from thecutter-shaft, substantially as shown and described.

5. The combination in a milling-machine with a cutter shaft or spindle,and means for rotating it, an inner eccentric sleeve surrounding saidshaft, an outer eccentric sleeve surrounding the inner, of a worm-wheelfixed to the inner sleeve and a worm fixed to the outer sleeve,substantially as shown and described.

6. The combination in a milling-machine, with a cutter shaft or spindleand means for giving it a motion of rotation upon its axis and ofrevolution about a center, of means for adjusting the diameter of thecircle of revolution at any amount from nothing to the maximum amount,substantially as shown and described.

7. The combination in a milling-machine, with a cutter shaft or spindleand means for giving it a motion of rotation upon its axis and ofrevolution about a center, of means for adjusting the diameter of thecircle of revolution at any amount from nothing to the maximum amount,and means for moving said cutter-shaft longitudinally, substantially asshown and described.

8. The combination in a inilling-machine, of a cutter shaft or spindle,double eccentric sleeves surrounding the same and means for rotatingthem, With a head movable longitudinally the cutter-shaft and havingbearings for the eccentric sleeves to rotate in, substantially as shownand described.

9. The combination in a milling-machine of a cutter-spindle, doubleeccentric sleeves of equal eccentricity surrounding the same, means forlocking the sleeves to each other at any position, and means forrotating them, with a head having journals for said eccentric sleevesand a guideway longitudinal the cutter-shaft, a guide for the same andmeans for moving the head therein, substantially as shown and described.

10. The combination in a milling-machine,

of a cutter-spindle, an inner eccentric sleeve surrounding thecutter-shaft, an outer eccentric sleeve surrounding the inner sleeve,means for adjusting the sleeves upon each other and for locking them inany position,

means for rotating the eccentric sleeves, with ERIC JOHNSON.

Vitnesses:

JOSEPH JOHNSON, H. L. REYNOLDS.

